1. There were undertones of relief as the visitors left.
   客人走后大家都暗暗松了口气.
2. You are a rare visitor.
   你可是稀客
3. The visitors were shown round [ over ] the castle.
   客人被带领走遍了古堡。
4. Call Building security if a visitor acts suspicious.
   如果来客行动诡异就打电话给大楼保安人员
5. He would have to efface himself before his visitors.
   他每每只好在客人面前躲而避之。

　1个名词解释